The average number of questions Lee and Hilda solved was 205. The average number of questions Hilda and Risa solved was 194. The average number of questions Risa and Lee solved was 183. How many questions did each of them solve?
- Hilda
- Lee
- Risa
(a)
Number of questions that Lee and Hilda solved
= 205 x 2
= 410
Number of questions that Hilda and Risa solved
= 194 x 2
= 388
Number of questions that Risa and Lee solved
= 183 x 2
= 366
Number of questions that Hilda solved
= (410 + 388 - 366) ÷ 2
= 432 ÷ 2
= 216
(b)
Number of questions that Lee solved
= 410 - 216
= 194
(c)
Number of questions that Risa solved
= 388 - 216
= 172
Answer(s): (a) 216; (b) 194; (c) 172
